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Histological features of the synovial membrane. (A) Change to the SSS over time. (B) (a) Changes to synovial membrane thickness over time. (b) Representative histological sections of synovial membrane stained with hematoxylin and eosin. Scale bar = 100 μm. (C) (a) Change in invading tissue over time. (b) Representative histological sections of invasion tissue stained with hematoxylin and eosin. Scale bar = 2 mm.
